I recently purchased a couple lightsabers from Ultrasabers.com and they rock. I got the Collectors Edition "Prophecy" RGB (meaning you can switch and mix up to seven different colors) and a Liberator V2 in Guardian Blue.
I have been wanting to duel with them ever since they came... and on March 11th I got my chance :)
My cousin Josh was pretty pumped about it and we took them outside to mess around a bit. After a five or so minutes we started filming and did this on the first try:
Lightsabers are awesome.